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Chitose`s homeroom and Japanese classics teacher. Devoted mother who wants to see him get the best grade possible. Will sometimes cry in order to make him study.
Mutsuki is a classic Japanese subject teacher and is also the homeroom teacher of Chitose. She will usually become strict on him when she sees him slacking off, or occasionally not showing up to his classes. At home is takes care of the cooking and sometimes the cleaning as well. When it comes to studying with Chitose she would try and trick him into thinking she is crying in order for him to start studying and make her feel better. Out the all the mother she has a driving license but has not driven for years.
At the very beginning of happy lesson advance her normal life is interrupted as her daughter comes back. Not being her real daugher Mutsuki promised this girl along time ago she would become her mother. This arrival affects Chitose as well and the two start fighting and causing much pain to Mutsuki.